Logic Masters Deutschland e.V.

Symmetry?

(Eingestellt am 13. April 2021, 20:16 Uhr von Qodec)

By shye, Ben, xoned, abed hawila, Botaku, ahaupt, Hackiisan, Qinlux, Ethz, Philip Newman, Zack Szekely, Strosahl, Reverend, Gliperal, and yours truly.

This puzzle is based on a collaboration puzzle by 15 authors. At some point it was my turn. I added a killer cage somewhere, attempting to create some interesting logic, but it turned out that this cage imploded the puzzle to only 2 solutions, without creating much of a solve path. Completely astonished by this, I had to figure out why. I can't say that I found a satisfactory answer, but this research did lead to a puzzle that I think is interesting enough to publish. All this does mean that the list of rules is longer than usual:

  • Normal sudoku rules apply.
  • Quadruple: the white circle with '1248' indicates that each of these digits must appear in one of the cells adjacent to the circle.
  • Clones: the two 2x2 grey areas in boxes 4 and 8 are clones. They contain identical digits in identical positions within the 2x2 grey area. The top left (r1c1) and bottom right squares (r9c9) are clones as well, and must contain the same digit.
  • Killer cages: an area surrounded by a dashed line is a 'cage'. Digits in a cage cannot repeat and sum to the number in the upper left corner.
  • Thermometer: the grey path indicates a thermometer. Digits in thermometers must increase from the bulb.
  • Kropki pairs: a black dot between two cells means that one of the digits in the cells is exactly double the other. Not all possible black dots are given.
  • Odd/even: Cells with an opaque grey circle must be odd. Cells with an opaque grey square must be even.

You can play this puzzle online using f-puzzles: https://f-puzzles.com/?id=ygtxxhnn.

Hope you will enjoy!

The break-in is the same as in the original puzzle. Because of this, I thought it appropriate to credit all original authors, regardless of whether or not their clue survived.

See https://f-puzzles.com/?id=yxk93l2d for the original puzzle.

Lösungscode: Row 7 and column 3. I.e. the 9 digits in row 7 from left to right, followed by the 9 digits in column 3 from top to bottom, for example: 123456789123456789

Zuletzt geändert am 14. April 2021, 11:35 Uhr

Gelöst von LKegel, dori_polic, NikolaZ, rimodech, emmettcito, monk, CaneloC, Cane_Puzzles, henter, mlkj, LMettrop, sandrokv, Playmaker6174, DJdoku, SirWoezel, JonnyKaufman, parkinson, CaballeroOscuro, haveo, ... galgamer, shafer, juventino188, michaal94, panthchesh, soroush, morgannamodeaura, bernhard, geronimo92, Burakiez, SimiC, Tove, NC1403, Mr.Menace, skywalker, Konzert, lygre455, cfop, alanprado
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Kommentare

am 17. April 2021, 09:29 Uhr von Qodec
Thanks everyone! I'm glad you enjoyed it!

am 16. April 2021, 19:50 Uhr von Aaronomys
The puzzle wasn't hard, but it was incredibly fun and satisfying to solve! Every deduction made my day better. :)

am 15. April 2021, 04:48 Uhr von matiasv5
This has been one of my favourites so far. Loved the flow, I was constantly making new deductions instead of getting very stuck at one particular point - yet it did not feel easy at all. Thanks!

am 14. April 2021, 15:48 Uhr von JonnyKaufman
Really enjoyed this one and the original. Thanks!

Zuletzt geändert am 14. April 2021, 13:45 Uhr

am 14. April 2021, 13:09 Uhr von Playmaker6174
Beautiful puzzle, every logic and deduction feels so important, which makes the puzzle go smoothly. I enjoy it very much, and congrats everyone for making a nice puzzle.
(I haven't done the original one yet but I'll take time)

*Extra* The original one is also very beautiful too, definitely a gem for my favorite sudoku collection. Both of the puzzles took me like half an hour for each of them, but I enjoyed every second of the ride.

am 14. April 2021, 11:35 Uhr von Qodec
Fix typo.

Zuletzt geändert am 14. April 2021, 09:33 Uhr

am 13. April 2021, 20:58 Uhr von LKegel
What a fascinating puzzle! Enjoyed it a lot

@LKegel Thank you!

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ID:0005ZC

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